Question

sendo U=Q resolva as seguintes equações do 1 grau com uma incógnita
a)7x+1-5x=9
b)y+9y+5=-15
c)17x-1=15x+3
d)16-x=x+25
e)20x-13=20+9x
f)21x+1=11x+6
g)9x-23=13x-27
h)0,8+2x=x+3,5
i)3,5x+1=3,1x+3
j)5-x-22=4x-11-6x

Answer 1

a)7x+1-5x=9
    2х = 9 - 1
    2х = 8
    х = 8 : 2
    х - 4 
b)y+9y+5=-15
10y = - 20
y = - 20 : 10
y = - 2

c)17x-1=15x+3
17x - 15x = 3 + 1
2x = 4
x = 4 : 2
x = 2
d)16-x=x+25
 - x - x = 25 - 16
- 2x = 9
- x = 9 : 2
x = - 4,5
e)20x-13=20+9x
20x - 9x = 20 + 13
11x = 33
x = 33 : 11
x = 3
f)21x+1=11x+6
21x - 11x = 6 - 1
10x = 5
x = 10 : 5
x = 2
g)9x-23=13x-27
9x - 13x = 23 - 27
- 4x = 4
- x = 4 : 4
x = - 1
h)0,8+2x=x+3,5
2x - x = 3,5 - 0,8
x = 2,7
i)3,5x+1=3,1x+3
3,5x - 3,1x = 3 - 1
0,4x = 2
x = 2 : 0,4
x = 5
j)5-x-22=4x-11-6x
- x - 4x + 6x = - 11 - 5 + 22
x = 6